Special casting material for main iron runner of iron-making blast furnace

Abstract

The invention discloses a special casting material for a main iron runner of an iron-making blast furnace. The special casting material is prepared from brown fused alumina granules, white alundum granules, white alundum powder, plate corundum micro powder, chromium concentrate, silicon carbide granules, silicon carbide powder, spherical asphalt, activated aluminum oxide, silica powder, pure calcium aluminate cement, metal silicon powder, metal aluminum powder, additives, anti-explosion fiber, carbon composite micro powder and the like according to a certain ratio. The special casting material has the advantages that aiming at problems that a main iron runner casting material of the blast furnace is generally poor in furnace slag corrosion resistance, slag lines are easy to deteriorate, the operation and the yield of the blast furnace can be affected, and the like, a refractory material which is good in slag corrosion resistance and good in abrasion and flushing resistance is compounded. According to the scheme, co-ground composite micro powder which is not easy to infiltrate by molten iron and slag is introduced, the silicon carbide granules, powder materials, plate corundum micro powder and chromium concentrate are introduced to improve the abrasion and flushing resistance, and by optimizing a binding agent and the additives, the comprehensive high temperature properties of the casting material for the main iron runner is ensured.

Description

technical field [0001] The invention relates to a refractory material for an iron-making blast furnace, in particular to a special pouring material for the main iron channel of an iron-making blast furnace. Background technique [0002] Blast furnace smelting intensity is high, the output is large, and the iron-making time is long. It is currently the most important iron-making method in the world. In China alone, the output of molten iron in 2013 reached nearly 800 million tons. However, when tapping the blast furnace, the slag-iron ratio of the molten iron flowing out from the taphole through the main iron trough is about 1:1~7:1 (the slag-iron ratio is relatively large when tapping iron in a small nickel-iron blast furnace). Since the slag contained in the molten iron is highly corrosive to the refractory material, the damage to the durability of the main iron ditch castable is higher than the high temperature erosion of the molten iron, so it often occurs that the slag e...

AI Technical Summary

Problems solved by technology

Since the slag contained in the molten iron is highly corrosive to the refractory material, the damage to the durability of the main iron ditch castable is higher than the high temperature erosion of the molten iron, so it often occurs that the slag erosion resistance of the iron ditch castable is not good As a result, the corrosion of the slag line is serious, and the main iron trench is frequently overhauled, resulting in waste of refractory resources, increased solid emissions, and increased intensity of workers' high-temperature dangerous operations.

At the same time, frequent maintenance of the main iron trough will directly affect the tapping of the blast furnace and reduce the output of the blast furnace

Images